对于大型XML文件的跟进问题:
首先感谢您的答复。 接下来...我做错了什么? 这是使用SAX的我的类:
public class SAXParserXML extends DefaultHandler {
public static void ParcourXML() {
DefaultHandler handler = new SAXParserXML();
SAXParserFactory factory = SAXParserFactory.newInstance();
try {
String URI = "dblp.xml";
SAXParser saxParser = factory.newSAXParser();
saxParser.parse(URI,handler);
} catch (Throwable t) {
t.printStackTrace ();
}
}
public void startElement (String namespaceURI,String simpleName,String qualifiedName,Attributes attrs) throws SAXException {
}
public void endElement (String namespaceURI,String simpleName,String qualifiedName) throws SAXException {
}
}
您可以看到,我对我的XML文件什么都没做,但它却出现了这个错误:
java.lang.OutOfMemoryError: Java heap space
at com.sun.org.apache.xerces.internal.util.XMLStringBuffer.append(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.refresh(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.invokeListeners(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.peekChar(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at javax.xml.parsers.SAXParser.parse(Unknown Source)
at SAXParserXML.ParcourXML(SAXParserXML.java:30)
at Main.main(Main.java:28)
我也尝试了Stax...出现了相同的错误...我该怎么办? 此外,我将Java堆大小增加到1260M。
java -Xmx1260M SAXParserXML
XML文件的格式如下所示:
<dblp>
<incollection>
<author>... </author>
....
<author>... </author>
#other tags-i'm interested only by <author>#
...
</incollection>
<incollection>
# the same thing#
</incollection>
....
</dblp>
你可以在以下链接找到原始文件:http://dblp.uni-trier.de/xml/。谢谢。